LUCENE-5969: don't use indexfilenames in these codecs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5969@1629105 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5969: clear nocommit

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5969@1629106 13f79535-47bb-0310-9956-ffa450edef68